Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Em qual rodada John Parco é um centro?
 ###Tabelas: CREATE TABLE draft_picks (draft_picks_id AUTO_INCREMENT PRIMARY KEY, Round VARCHAR, Player VARCHAR, Position VARCHAR, Nationality VARCHAR, College/Junior/Club Team (League) VARCHAR) CREATE TABLE total_playoff_berths_while_in_the_afl_afc_east (total_playoff_berths_while_in_the_afl_afc_east_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Division Titles INT, Playoff Berths INT, AFL Titles INT, AFC Championships INT, Super Bowl Championships INT) CREATE TABLE distribution_and_production (distribution_and_production_id AUTO_INCREMENT PRIMARY KEY, Rank VARCHAR, Country VARCHAR, 2009 VARCHAR, 2010 VARCHAR, 2011 VARCHAR) CREATE TABLE guest_performances (guest_performances_id AUTO_INCREMENT PRIMARY KEY, Week VARCHAR, Performer(s) VARCHAR, Hot 100 Reaction VARCHAR, Hot Digital Songs Reaction VARCHAR, Notes VARCHAR) CREATE TABLE premier_division_final_table (premier_division_final_table_id AUTO_INCREMENT PRIMARY KEY, Position INT, Team VARCHAR, Played INT, Drawn INT, Lost INT, Goals For INT, Goals Against INT, Goal Difference VARCHAR, Points 1 VARCHAR)  
SELECT Round FROM draft_picks WHERE Position = center AND Player = john parco